Upstream information

CVE-2026-48809 at MITRE

Description

python-engineio is a Python implementation of the Engine.IO realtime client and server. Versions prior to 4.13.2 have two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases are POST requests, when using ASGI with the long polling transport and WebSocket messages, when using Aiohttp with the WebSocket transport. Version 4.13.2 addresses this issue. ASGI severs now only load the body of incoming requests into memory after the client is confirmed to be known and authenticated, and the payload size is below the maximum allowed size. Requests that do not comply with these requirements are discarded. Aiohttp servers configure the maximum payload size in the underlying WebSocket layer from Aiohttp, so that large messages are discarded by Aiohttp before they are delivered to python-engineio.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 7.5 7.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
CVSS v4 Scores
CVSS detail SUSE
Base Score 8.7
Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Attack Vector Network
Attack Complexity Low
Attack Requirements None
Privileges Required None
User Interaction None
Vulnerable System Confidentiality Impact None
Vulnerable System Integrity Impact None
Vulnerable System Availability Impact High
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact None
Subsequent System Availability Impact None
CVSSv4 Version 4.0
SUSE Bugzilla entry: 1269545 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise Desktop 15 SP7
SUSE Linux Enterprise Module for Python 3 15 SP7
SUSE Linux Enterprise Server 15 SP7
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • python311-python-engineio >= 4.3.4-150600.3.3.1
 Patchnames:
SUSE-SLE-Module-Python3-15-SP7-2026-3085
SUSE Linux Enterprise Server 15 SP6-LTSS
  • python311-python-engineio >= 4.3.4-150600.3.3.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-3085
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • python311-python-engineio >= 4.3.4-150600.3.3.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP6-2026-3085
openSUSE Leap 16.0
  • python313-python-engineio >= 4.12.0-bp160.2.1
 Patchnames:
openSUSE-Leap-16.0-packagehub-377
openSUSE Tumbleweed
  • python311-python-engineio >= 4.13.3-1.1
  • python313-python-engineio >= 4.13.3-1.1
  • python314-python-engineio >= 4.13.3-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-11170

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 python-python-engineio Released
SUSE Linux Enterprise Module for Python 3 15 SP7 python-python-engineio Released
SUSE Linux Enterprise Server 15 SP7 python-python-engineio Released
SUSE Linux Enterprise Server for SAP Applications 15 SP7 python-python-engineio Released
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise Module for Python 3 15 SP6 python-python-engineio Affected
SUSE Linux Enterprise Server 15 SP6 python-python-engineio Affected
SUSE Linux Enterprise Server 15 SP6-LTSS python-python-engineio Released
SUSE Linux Enterprise Server for SAP Applications 15 SP6 python-python-engineio Released
Products past their end of life and not receiving proactive updates anymore.
SUSE Linux Enterprise Desktop 15 SP6 python-python-engineio Affected
openSUSE Leap 15.6 python-python-engineio Released

SUSE Timeline for this CVE

CVE page created: Sat Jun 27 00:00:09 2026
CVE page last modified: Fri Aug 28 20:05:58 2026